Image of the Week: Dynamical holographic Moirés in a TEM

By Dean Williams on July 25, 2016

Phase image simulation of a sphere including experimental phase distortions due to the microscope setup (projector lens and CCD camera)

This week’s image of the week is a phase image simulation of a sphere with a positive charge of 100 e, including experimental phase distortions due to the microscope setup (projector lens and CCD camera).

This article is part of the JPhysD special issue on Electron Holography, Guest Edited by the co-author of this paper, Etienne Snoeck (CEMES-CNRS/Université Paul Sabatier, Toulouse, France). The article looks at dynamical holographic Moirés (DHMs) in transmission electron microscopy (TEM).

As Etienne explains, “The technique described in this paper combines electron holography and Moirés patterns to improve the field sensitivity achievable in TEM through a frequency study and to develop the so-called dynamical holographic Moirés (DHM) method. The basic idea of DHM is to superimpose two holograms obtained on a same area of an object which is periodically stated in two different but controlled configurations (either electrostatic or magnetic). The overlapping of both holograms gives rise to Moirés contrasts in the final amplitude image carried out by the fringes of the holograms.”

This work is licensed under a Creative Commons Attribution 3.0 Unported License